Green hydrogen, derived from the electrolysis of water using renewable energy sources, is poised to become a vital component of future low carbon energy systems. While its role in domestic settings is still debated, green hydrogen is acknowledged for its potential in industry and as a strategic power reserve. The transition from grey hydrogen, produced through polluting methods, to green hydrogen is crucial for achieving net zero emissions targets. However, the current storage infrastructure, primarily relying on salt caverns, is insufficient to meet the projected demand for hydrogen storage. The UK, despite having notable salt cavern projects, is facing limitations in capacity, requiring immediate action to address storage capacity constraints. To support the widespread adoption of green hydrogen, innovative solutions like mid-scale hydrogen buffer storage are essential, particularly for industrial off-takers and distribution networks. Projects like Project Union in the UK are pioneering the repurposing of gas transmission infrastructure for hydrogen transportation, emphasizing the need for medium-scale storage solutions. As the demand for green hydrogen continues to grow, investments in diverse storage infrastructure will be critical for a successful energy transition towards a low carbon future.